First R code chunk in R Markdown Disappears When Options Specified

[jwpaulson]

Using the latest version of knitr from github (0.6.1, but also repros with 0.5 from CRAN), the first R code chunk will disappear when any option is specified. For example if you place the following code into a test.Rmd file:

Test

```{r, echo=TRUE}
summary(cars)
```

Then calling the following command from R (being in the appropriate directory):

> knit("test.Rmd")

It will create a .md file with just Test and nothing else. This was discovered in RStudio, but was reproduced outside of RStudio with R 2.14.2 on a Mac running OS X 10.6.8.

http://support.rstudio.org/help/discussions/problems/2574-not-recognising-first-r-code-chunk-in-r-markdown

Let me know if you need any additional information to reproduce.

Josh

[Dasonk]

Change it to

```{r echo=TRUE}

or

```{r thisisyourlabel, echo=TRUE}

The first argument after the r can't have a comma before it.

[yihui]

Thanks, @Dasonk You are correct that @jwpaulson was using the wrong syntax. The correct syntax is ````{r options}, i.e. {r` followed by a space rather than a comma. The letter `r` is not part of chunk options; it is just part of the identifier.

[jwpaulson]

I must have been really tired last night on the plane as that is an obvious error by me. I was trying to reproduce a few problems that users posted and thought I found two at once! Thanks for the immediate response and correction.

Josh

[yihui]

You are not the only person who was confused by the syntax, so this could be well considered as a bug (my philosophy is FAQ's are nearly bugs). The fix will appear in my next push.

[yihui]

@jwpaulson the comma after r will no longer cause problems after v0.6 (a new version will be on CRAN soon)

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